*{
    padding: 0;
    margin: 0;
}
html,body{
    width: 100%;
    height: 100%;
    background-color: black;
}
.ji{
    width: 100%;
    height: 70px;
    margin-top: 10%;
    background-image: linear-gradient(#B1B0B0,#5F5F5F);
}
.wai{
    margin-left: 30%;
}
.tu{
    width: 90px;
    text-align: center;
    line-height: 70px;
    border: 1px solid black;
    height: 68px;
    float: left;
    background-image: radial-gradient(to 45deg,#9B9B9B,#3A3A3A);
}
.tu:hover{
    cursor: pointer;
    background-image: linear-gradient(#BB6800,#F3D76F);
}
.tu2:hover{ 
    background-image: -webkit-radial-gradient(bottom center,#5AA3E6,#1C57A0);
    cursor: pointer;
}
.tu3:hover{
    background-image: -webkit-radial-gradient(bottom center,#D07B9A,#A2124D);
}